binman: doc: Add documentation for Xilinx Bootgen bintool

Add documentation for the 'bootgen' bintool

Signed-off-by: Lukas Funke <lukas.funke@weidmueller.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/tools/binman/bintools.rst b/tools/binman/bintools.rst
index 9d8f1619f204bcce064213d267a7fd9c3fddfef1..20ee24395af47df2d749d1bc7cd99e0c8ba96fc9 100644 (file)
--- a/tools/binman/bintools.rst
+++ b/tools/binman/bintools.rst
@@ -204,3 +204,15 @@ Normally signing is done using `mkimage` in context of `binman sign`. However,
 in this process the public key is not added to the stage before u-boot proper.
 Using `fdt_add_pubkey` the key can be injected to the SPL independent of
 `mkimage`
+
+
+
+Bintool: bootgen: Sign ZynqMP FSBL image
+---------------------------------------------
+
+This bintool supports running `bootgen` in order to sign a SPL for ZynqMP
+devices.
+
+The bintool automatically creates an appropriate input image file (.bif) for
+bootgen based on the passed arguments. The output is a bootable,
+authenticated `boot.bin` file.